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SUMMARY:Interaction of Low Energy Electrons with Matter - Wolfgang Werner
DTSTART:20180423T100000Z
DTEND:20180423T110000Z
UID:TALK104656@talks.cam.ac.uk
CONTACT:Mrs Charlotte Jenkins
DESCRIPTION:Low energy electrons (0 - 10+ eV) play an important role in pr
 esent day science and technology. After a brief presentation of the most i
 mportant applications and the challenges associated with them\, the talk w
 ill focus on the understanding of the fundamental mechanism for secondary 
 electron emission and prediction of the secondary electron yield (SEY) bas
 ed upon it. The question on the availability of fundamental parameters ent
 ering the common models is discussed and some approaches to obtain consist
 ent values for important parameters such as the work function\, the electr
 on affinity and most importantly\, the inelastic mean free path are presen
 ted. The second part of the talk will focus on an experimental approach ai
 ming to directly observe the energy and momentum transfer from the primary
  particle inducing the secondary electron to the ejected secondary electro
 n by measuring the two involved particles in coincidence. In this way it i
 s generally possible to relate the energy loss processes (e.g. plasmon exc
 itation) to the electronic channel of energy dissipation. In the case of H
 OPG\, this turns out to be mediated by both the dielectric response as wel
 l as the band structure of the solid. This plasmon decay spectroscopy tech
 nique is discussed and first results are presented.
LOCATION:Mott Seminar Room
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